LocationAnimation.WPF

MapControl/WPF/LocationAnimation.WPF.cs

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+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// Copyright © 2024 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using System;
+using System.Windows;
+using System.Windows.Media.Animation;
+
+namespace MapControl
+{
+    public class LocationAnimation : AnimationTimeline
+    {
+        public override Type TargetPropertyType => typeof(Location);
+
+        public Location To { get; set; }
+
+        public IEasingFunction EasingFunction { get; set; }
+
+        protected override Freezable CreateInstanceCore()
+        {
+            return new LocationAnimation
+            {
+                To = To,
+                EasingFunction = EasingFunction
+            };
+        }
+
+        public override object GetCurrentValue(object defaultOriginValue, object defaultDestinationValue, AnimationClock animationClock)
+        {
+            var from = (Location)defaultOriginValue;
+            var progress = animationClock.CurrentProgress ?? 1d;
+
+            if (EasingFunction != null)
+            {
+                progress = EasingFunction.Ease(progress);
+            }
+
+            return new Location(
+                (1d - progress) * from.Latitude + progress * To.Latitude,
+                (1d - progress) * from.Longitude + progress * To.Longitude);
+        }
+    }
+}